Grinding-machine.



H. B. ROBINSON. GRINDING MACHINE.

AYPLIUATIO` FILED 3111220, 1906.

905,461. Patented Dee. 1,1908.

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APPLICATION FILED JAN. 20,1906.

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H; B. RUBINSON. GRINDING MACHINE.

Patented Dec. 1, 1908,

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N UNITED STATES HOWARD B. ROBINSON, OF HARTFORD, CONNECTICUT.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Dec. 1, 1908.

Application filed January 20,'1906. Serial No. 296,974.

To all whom it 'may concern:

Be it known that I, HOWARD B. ROBINSON, a citizen of the United States, residing at Hartford, in the county of `Hartford and State of Connecticut, have invented certain new and useful Improvements in Grinding- Machines, of which the following is a specification.

This invention relates to grinding-machines of the kind employed for universal purposes, and the object thereof is the provision of a light, portable .machine of simple elemental construction, and .one which may be employed as a tool of general utility for surface-finishing, for sharpening purposes, and for various other work within its capacity and unnecessary to mention.

A further object of the invention is the provision of a vertical post or column, a spindle carrying a grinding-tool or a pair of grinding-tools and a rest movable around the column, and capable of being set to operate with either grinding-tool when a pair is employed.

A further object of the invention is the provision of a pivoted work-supporting table and of means for adjusting said table to vary its angular relation to the grindingtool.

Other objects of the invention will be herevinafter set forth.

In the accompanying drawings, Figure 1 is a front view of the improved machine, Fig. 2 is a side view thereof, and Fig. 3 is a detail view.

Referring to the drawings, the numeral 5 designates a column rising from a base (not shown) or other portable form of support. At its top this column is provided with a removable flange 6, and on the column below the fiange is fitted a split-collar 8, clamped to the column by a bolt 9, said collar having bearings 10 for the reception of a spindle 11. On the spindle is a belt-pulley 12 spaced from the bearings by hubs 13 integral with said pulley, and designated by 14 are disks, each of which serves as a support for Grinding-wheels 15 15', each wheel being forced against the disk by a washer 16 and a nut 17 threaded upon the spindle 11. Other means may, however, be provided for accomplishing the results just described without departure from the invention,it being immaterial how the grinding-wheels are clamped to the spindle.

It s necessary in various machines to l which my invention relates to provide means j for supporting work for either grindingl wheel, and these wheels may be of different kinds, for instance, one for rough grinding, and the other for finishing purposes.

Here it may .be stated that the invention is not limited to grinding-wheels, for milling, polishing or other wheels may be employed for working upon the material.

On the column 5 below the split-collar 8 is a split-collar 18 adjustable vertically upon said column, and capable of being clamped thereto at any point desired by a bolt 19. A work-supporting table 20 is shown connected at its rear end to the collar 18 by pivot-bolts 21 upon which the table may swing when angularly adjusted in the man ner hereinafter described. Below the collar 18 the column is equipped with a circular flange 22 and above said flange and fitted on the column is mounted a support 23 having a hub 23. In one end of this support is threaded a screw 24, upon the upper end of which the work-table 20 rests. -This screw 24 is provided with a shank 24', and with a pair of angular wrench-engaging surfaces 25, 25', one of which that marked 25', will act as a stop to limit the upward movement of the screw. Rigid with the support 23 is an angular bracket 26, said bracket being secured to the support by a bolt 27. In the arm 26 of said bracket is an aperture for the reception of the swivelebolt 27x which may be locked in place by a nut 28, or in any other desired manner. This bolt passes through a hub 29 fitting on the top of the bracket 26, and the head 27 of the bolt covers the top of said hub. In the outer slotted end of the arm 29 is formed a slot 295 for the reception of a tubular bolt 30, said tubular bolt passing through the slot 293 in the swinging arm 29, and the lower end of said tubular bolt being threaded at 30 to receive a nut 31 for securing it in position.

A lever-screw 32 is threaded into the head of the tubular bolt 30 and the end of said screw bears against the shank 302, and serves firmly to clamp the same in position. At its upper end the shank 302 is enlarged at 303 to form a seat for a trunnion projecting from a table 33, the construction being such that said table may support a tool or other work to be dressed or sharpened by either the side or the periphery of either grindingwheel 15 or 15. As will be observed from the drawings, byloosening the nut 28, the

arm 29 may be swung from the position shown in Fig. 1,'where it is in readiness to support work to be dressed by the disk 15, to a similar position opposite the grindingdisk 15', or in front of said disk, the table 20 being lowered to enable this adjustment. Provision is also made for the vertical adjustment of the table 33, by raising and lowering the shank 302 in the tubular bolt 30, and then securing it in position by the binding-screw 32. Top surface finishing at any desired angle may be made by supporting the work upon the table 20, and adjusting said table by means of the screw 24, and articles supported on the adjustable table 33 may be placed in any desired relation to either grinding tool by adjusting the shank 302 in the manner described, and by swiveling said table 33 in its seat in the top of the shank. By adjusting the'collar 1S up or down on the column 5 the position of the table Q0 may be varied as desired, and the same result is accomplished as regards table 33 by adjusting shank 30L in the bolt 30. In this way provision is made for universal grinding by a tool of simple, light, compact, and portable construction, one that will be useful in dressing many classes of Work now requiring the employment of different machines.

As will be understood the invention is not necessarily limited to the details of construction shown, for the work-supporting tables may be adjusted by means different from those illustrated and described, and the swiveling connections may also be different, without departure from the invention.

Having thus described my invention, what I claim isj l. The combination of a standard, a rotary shaft connected with said standard and having means for supporting a plurality of tools, a bracket attached to said standard, a swinging arm supported by said bracket, a member adjustable longitudinally of said arm, a second member adjustably connected with the first adjustable member, and a work support associated with the second adjustable member.

2. The combination of a standard, a rotary shaft connected with said standard and having means for supporting a plurality of tools, a bracket attached to said standard, a swinging arm supported by said bracket and having a slot, a bolt adjustable in said slot, a nut on the bolt for engaging said arm to hold the bolt in an adjusted position, a worksupport having a depending shaft adjustable through said bolt, and means carried by the bolt for holding the shank in an adjusted position.

In testimony whereof I affix my signature in presence of two witnesses.

HOl/VARD B. ROBINSON.

Witnesses:

IVM. I-I. BLODGETT, J r., J. D. VVooD. 

